Automatic rotary-spider bushing



'1,62 4 Apnl 19, 1927. I F. HERTZBERG i 5,5 0

AUTOMATIC ROTARY SPIDER BUSHING Filed Aug. 13, 925 2 Sheets-Sheet 1 25/ Z f ff F"5 /Z/:Q-z/ Epi L April 19, 1927.

F. HERTZBERG AUTOMATIC ROTARY SPIDER UsHING Filed Aug-13, 1925 Sheets-Sheet 2 fz zo f4 No :J1/wanton If Her z'e/y,

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Patented Apr. 19, 1921-.

PATENT OFFICE.

i FRANK HERTZBERG, QF LOMITA, CALIFORNIA'.

Aumentano ROTARY-SPIDER. ylausanne.

Application mea Augm`1s, 1925. semina. 50,101.

c This invention relates to pipe holding def vices of that typensed in connection with a rotary orother well drilling apparatus and comprising a bushing or spider carried by the rotatable table of therotary and. slips placed in the bushing when it is desired to support the pipe and removed from the bushing when it 1s desired to lower the pipe into the well.

The invention has for one of its objects the provision of a pipe holding device of the character stated wherein the slips shall be permanently connected to the bushing or spider whereby to obviate the time and labor now involved in placing the slips in and removing them from the bushing or spider.

A further object of the invention is the provision of a pipe holding device of the character stated which shall include novel and simple means adapted to permit the slips to be readily and quickly raised when 'it is desired to release the pipe and lowered when it is desired to grip the pipe, the means being carried by the bushing or spider and connected to the slips.

A further object of the invention is the provision of novel and simple means for slidably connectin the slips within the bushing or spider an novel and simple means for preventing injury to said first named means.

The foregoing and other objects are attained by the construction, combination and arrangement of parts hereinafter fully described and claimed, and illustrated in the accompanying drawings, wherein:

Figure 1 is a view in side elevation of the pipe holding device;

F1gure 2 is a top plan view of the pipe holding device;

Figure 3 is a sectional view taken on the vertical plane indicated by the line 3 3 of Figure 1;

Figure 4 is a sectional view taken on the horizontal plane indicated by the line 4 4 of Figure 1;

Figure 5 is an elevational view of one of the bushing or spider sections and the unit of slips carried thereby, and

Figure 6 is a detail perspective viewy of tpe master or center sl1p.of each unit of s 1 sI orresponding and likeparts are-referred to in the following description; and designated in the several views of the accompanying drawings, by similar reference numerals.

Thebushing or vspider is designated 1 and is provided at its upper Yend with an outwardly directed flange 2 for supportin it in the rotatable table of a rotary or oier well drilling apparatus. The rotatable table is suggested by dotted lines in Figures 1 and 2 an designated 1a. It is provided with a conical or tapered central opening and vis of sectional formation, the sections thereof being similar. The bushinfr 1 is provided in its inner upper edge with a groove 3 and at its lower end with an inwardly directed rib 4. A sectional plate 5 having a central opening 6 is seated in the groove 3 and removably secured in place by screws 7. Axially arranged dovetail grooves 8 extend from the horizontal wall of the groove 3 to the rib 4 for the reception of similar ribs 9 on the slips 10.

The vertical dimension of the slips 10 is less than the corresponding dimension of the bushing or spider 1. The ribs 9 permanently and slidably connect theslips 10 to and within the bushing 1. The slips 10 are `adapted to be raised with respect to the bushing 1 to release the pipe and lowered with respect to the bushing to grip the pipe.` The slips 10 rest upon the shoulders when they are in their lowered or gripping position. Axial ribs 11 carried by the bushing 1 between the grooves 8 engage in grooves 12 in the outer vertical corners of the slips 10, and are adapted to prevent the slips 10 from being rotated with respect to the bushing 1. The slips 10 are yieldingly retained in their lowered or gripping position by springs 13 which are positioned in the grooves 8 between the upper ends of the ribs 9 and the lower side of the plate 5.

The slips 10 each comprise a body portion 14 of relatively soft and a face portion 15 of relatively hardsteel. The ribs 9 are formed integrally with the body portions 14. The face portions 15 are provided with dovetail ribs 16 through the medium of which they are secured to the body portions 14. The inner sides of the face portions 15 are of arcuate formation and provided with transversely extending teeth 17. The slips 10 of each bushing section are connected together so as to permit them to be raised or lowered as a unit, and'to this end they are connected together by lugs 18 extending from the vertical sides of the center slip alnd loosely itting in openings 19 in the side s ips.

A shaft 20 journaled asat 21 upon the upper end` of each bushing section and prov1 ed with a crank 22, and a link 23 connected to the crank 22 and to the center slip of each bushing, provide means by whic the slips can be moved into and supported in raised or releasing position. To ermit the shafts 20 to be readily operate they are provided at their ends wlth levers 24 having upturned handle portions 25.

In practice the slips 10 are retained in a raised or releasing position until it is desired to support the pipe for the purpose of attaching another section thereto and then the shafts 20 are swung to release the slips 10. As soon as they are released, the slips 10 are forced downwardly in the bushing or spider by the springs 13, and when the are in their lowcrmost Iposition they wil grip and hold the pipe. uring their downward movement within the bushing or spider, the slips 10 move laterally and radially in the direction of each other, and during their u ward movement within the bushing or spi er they move laterali and radlally away from each other. he late 5 prevents injury to the slips 10 Whi e they are in raised position. cated at the top of the bushing the slips 10 may be readily moved into the desired position.

It is to be understood that the invention As the shafts are lois not limited to use in connection with a rotary or other well drilling apparatus as it is capable "of being used in other applications necessitating the employment of a bushing or spider and slips. It is further to be un derstood that the device shown is merely illustrative, and that such changes may be made therein when desired as are within the sco of the inventionas claimed,

lehat is claimed is:

1. In combination, a bushing internally tapered and rovided with axial ooves opening out t rough the inner side t ereof, ribs located within the bushing betwn the grooves and extending axially of the bushing, slips located within the bushing and provided with ribsfitting in said grooves and having their outer vertical corners grooved to receive said ribs, and slip operating means.

2. In combination, a bushing internally tapered, units of slips mounted within the bushing for axial movement with res ct thereto, said slips being of less length t an the vertical dimension of the bushing, elements loosely connecting the slips of the respective units, shafts journaled on the upper end of the bushing and provided with cranks, and links connected to the cranks and to the upper end of a slip of each unit.

In testimony whereof 'I ax m si iature.

FRANK HER ZB RG. 

